Cisco Router: Able to ping Interface but not network Behind it.

Hi Guys,

Just configured a router. There are two directly connected interfaces. I am able to ping to both inteferaces. Interface f0/0 ip address is 172.25.0.254 and all of 172.25.x.x network is accessible. Interface f0/1 IP address is 172.26.0.254 , I am able to ping the interface 172.26.0.254 but all of 172.26.x.x network is inaccessible. Can't figure out the reason. I have modified the Duplex and Speed in every possible way but still no luck. The Configuration is pasted below. No Access Lists are configured.
All and Any help will be appreciated.

Like I said I connected my PC directly with the router. And also via layer2 switch. Both times it didn't work which sort of slidifies my suspicion that the router interface is not ok.
One thing that baffles me though is that why would it respond to icmp when the interface IP is selected.

To exclude Hardware problem interface, cables and IOS bugs try to switch over the configuration. So configuration fa0/0 will be reconfigured to fa0/1 and fa0/1 will be fa0/0. Switch the cables and see what happens.

If the problem stay the same, with other words 172.25. has now problems and 172.26 is working now fine --> Hardware problem fa0/1 --> if the problem switch over from interface to interface then it is a IOS or configuration issue ... and is located on th 172.26 site. How about "no ip subnet-zero" .... You never know ...

Questions
1. Tried new patch cables ?? (wiscom: suggested)
2. When connected to a cisco switch, does "#sh cdp neighbor" show the connection ?
3. Have you swapped the config on Fa0/0 and Fa0/1 (wicom: suggested)
Check if the problem follows the port or the config.

1. Tried new patch cables ?? (wiscom: suggested) : Yes ..Still no luck
2. When connected to a cisco switch, does "#sh cdp neighbor" show the connection ? ..Yes
3. Have you swapped the config on Fa0/0 and Fa0/1 (wicom: suggested) ..No coz the router is in production and do't want it to go down on me. Might try it on Friday.

Meanwhile I ordered a new router, should be here by tomorrow. The 172.26.x.x network is currently routed via a windows server :)
Check if the problem follows the port or the config.

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